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  CREATE TABLE test1 ( a INT, b INT);
  INSERT INTO test1 SELECT generate_series(1,100000),generate_series(1,100000);

    Objective: For a DML query with an Aggregate without a Group-By, ensure
    that the split agg produces a plan where Global Aaggregation is
    performed on a single segment, Gather(segment), insetad of
    Gather(master) such that we can optimized such DML queries by not
    involving master node at all.  The test ensures that the optimization
    framework enforces a Sigleton Segment distrbution for global agg.

  explain CREATE TABLE t AS SELECT AVG(a) FROM test1 JOIN (SELECT i  FROM UNNEST(ARRAY[1,2,3,54]) i) t ON (test1.a = t.i);
 ]]>
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        <dxl:DistrOpclasses/>
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        <dxl:CTASOptions OnCommitAction="NOOP"/>
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            <dxl:Cost StartupCost="0" TotalCost="438.378842" Rows="1.000000" Width="12"/>
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          <dxl:ProjList>
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              <dxl:Ident ColId="10" ColName="avg" TypeMdid="0.1700.1.0"/>
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            <dxl:Filter/>
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              <dxl:Properties>
                <dxl:Cost StartupCost="0" TotalCost="438.378817" Rows="1.000000" Width="8"/>
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              <dxl:GroupingColumns/>
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                <dxl:Filter/>
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                    <dxl:Cost StartupCost="0" TotalCost="438.378787" Rows="1.000000" Width="8"/>
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                  <dxl:GroupingColumns/>
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                      <dxl:Filter/>
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                        <dxl:Columns>
                          <dxl:Column ColId="0" Attno="1" ColName="a" TypeMdid="0.23.1.0" ColWidth="4"/>
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                          <dxl:Column ColId="8" Attno="-8" ColName="gp_segment_id" TypeMdid="0.23.1.0" ColWidth="4"/>
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                        <dxl:Cost StartupCost="0" TotalCost="0.014387" Rows="1000.000000" Width="4"/>
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                      <dxl:Filter/>
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                        <dxl:Properties>
                          <dxl:Cost StartupCost="0" TotalCost="0.004000" Rows="1000.000000" Width="4"/>
                        </dxl:Properties>
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                            <dxl:Ident ColId="9" ColName="unnest" TypeMdid="0.23.1.0"/>
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                        <dxl:ConstValue TypeMdid="0.1007.1.0" Value="AAAAKAEAAAAAAAAAFwAAAAQAAAABAAAAAQAAAAIAAAADAAAANgAAAA=="/>
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                    </dxl:RedistributeMotion>
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                </dxl:Aggregate>
              </dxl:GatherMotion>
            </dxl:Aggregate>
          </dxl:RandomMotion>
        </dxl:Result>
      </dxl:PhysicalCTAS>
    </dxl:Plan>
  </dxl:Thread>
</dxl:DXLMessage>
